21721340

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{12203}}^1$

素因数の和:12301

約数の個数: 24

約数和(自身を含む): 46131120

約数和(自身を除く): 24409780

約数列:

[1, 2, 4, 5, 10, 20, 89, 178, 356, 445, 890, 1780, 12203, 24406, 48812, 61015, 122030, 244060, 1086067, 2172134, 4344268, 5430335, 10860670, 21721340]

約数ペア:

[(1, 21721340), (2, 10860670), (4, 5430335), (5, 4344268), (10, 2172134), (20, 1086067), (89, 244060), (178, 122030), (356, 61015), (445, 48812), (890, 24406), (1780, 12203)]